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When the fight for gay marriage began to gain traction back in the early years of the last decade, social conservative critics usually went beyond denying that marriage could be redefined to include same-sex couples. Many of them argued that homosexuals were much less inclined than heterosexuals to valorize the ideal of monogamy. Allowing gays and lesbians to marry would therefore introduce a polyamorous option into the institution, and adultery would come to be viewed as an acceptable option for all marriages.
A spate of recent articles explicitly making the case for polyamory would seem to vindicate those conservative predictions and worries.